Cover fastener



FIG. 1 is a side view of the cover fastener in the unlocked position.

FIG. 2 is a reduced scale front view thereof in the locked position; and,

FIG. 3 is a side view thereof in the locked position.

The broken line showing of a nut is for illustrative purposes only and forms no part of the claimed design.

Cover fastener is characterized by a screw shaped design with a retractable insert. 

The ornamental design for a cover fastener, as shown and described. 